Dude, I've seen many posts saying "Chinese people lack manners" or videos. Not to be rude or anything, but it's misunderstood. I'm Chinese, I'll prove you wrong that they aren't rude.
Things like this (spitting, slurping, etc.) is allowed in China, but many Western countries call them rude. Younger people are generally more polite due to better education, better health and they didn't go through what older Chinese have.
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